zentao/extension/lite/search/ext/config/lite.php

<?php
unset($config->search->fields->bug);
unset($config->search->fields->product);
unset($config->search->fields->build);
unset($config->search->fields->case);
unset($config->search->fields->productplan);
unset($config->search->fields->release);
unset($config->search->fields->testtask);
unset($config->search->fields->testsuite);
unset($config->search->fields->effort);
unset($config->search->fields->caselib);
unset($config->search->fields->testreport);
unset($config->search->fields->program);